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28 March 2024
 
  » arxiv » 2108.07868

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The 2019 outburst of the 2005 classical nova V1047 Cen: a record breaking dwarf nova outburst or a new phenomenon?
E. Aydi ; K. V. Sokolovsky ; J. S. Bright ; E. Tremou ; M. M. Nyamai ; A. Evans ; J. Strader ; L. Chomiuk ; G. Myers ; F-J. Hambsch ; K. L. Page ; D. A. H. Buckley ; C. E. Woodward ; F. M. Walter ; P. Mróz ; P. J. Vallely ; T. R. Geballe ; D. P. K. Banerjee ; R. D. Gehrz ; R. P. Fender ; M. Gromadzki ; A. Kawash ; C. Knigge ; K. Mukai ; U. Munari ; M. Orio ; V. A. R. M. Ribeiro ; J. L. Sokoloski ; S. Starrfield ; A. Udalski ; P. A. Woudt ;
Date 17 Aug 2021
AbstractWe present a detailed study of the 2019 outburst of the cataclysmic variable V1047 Cen, which hosted a classical nova eruption in 2005. The peculiar outburst occurred 14 years after the classical nova event, lasted for more than 400 days, and reached an amplitude of around 6 magnitudes in the optical. Early spectral follow-up revealed what could be a dwarf nova (accretion disk instability) outburst in a classical nova system. However, the outburst duration, high velocity ($>$2000 km s$^{-1}$) features in the optical line profiles, luminous optical emission, and the presence of prominent long-lasting radio emission, together suggest a phenomenon more exotic and energetic than a dwarf nova outburst. There are striking similarities between this V1047 Cen outburst and those of "combination novae" in classical symbiotic stars. We suggest that the outburst may have started as a dwarf nova that led to the accretion of a massive disk, which in turn triggered enhanced nuclear shell burning on the white dwarf and eventually led to generation of a wind/outflow. From optical photometry we find a f{possible} orbital period of 8.36 days, which supports the combination nova scenario and makes the system an intermediate case between typical cataclysmic variables and classical symbiotic binaries. If true, such a phenomenon would be the first of its kind to occur in a system that has undergone a classical nova eruption and is intermediate between cataclysmic variables and symbiotic binaries.
Source arXiv, 2108.07868
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